World Mental Health Day: Mental Health Crisis Costs UK 16.4 Million Working Days as Younger Workers Disproportionately Impacted – HR News

Summary

Stribe analysed 2025 health and workplace data ahead of World Mental Health Day and highlights the scale and cost of mental ill health in UK workplaces. Mental health problems (stress, depression, anxiety) are estimated to cause 16.4 million working days lost annually and cost UK employers between £53bn and £56bn a year. The analysis draws on CIPD, NHS, HSE, ONS and other sources to show long-term absence is driven largely by mental ill health, younger workers (18–24) are especially hard hit, and many employers still lack basic manager training to respond effectively.

The report emphasises that investing in workplace mental health pays: every £1 spent returns about £5.30 through reduced absence and turnover. It sets out practical employer actions such as manager training, reasonable adjustments, feedback surveys and mental health first aid to cut absence and improve retention.

Key Points

Mental ill health causes 16.4 million working days lost (HSE, 2022/23) and accounts for 49% of working days lost from illness or non-fatal injury.
Mental health conditions are the leading cause of long-term absence (41%) and the second cause of short-term absence (29%).
The average person with work-related stress, depression or anxiety takes 21.1 days off per year.
UK employers face an estimated annual cost of £53bn–£56bn due to poor employee mental health (Deloitte).
Younger workers (18–24) are disproportionately affected: unpaid overtime (48%), extra hours due to cost of living (46%), and lower ability to switch off (33% vs 46% for 55+).
Comfort discussing stress with managers among 18–24s has fallen from 75% to 56% in the past year, signalling a breakdown in trust with management.
Although 89% of organisations say they prioritise wellbeing, only 29% train line managers in mental health support; trained managers report 73% confidence in sensitive conversations.
89% of employees say mental health impacts their working life and more than half have considered resigning because of poor mental wellbeing.
NHS figures show 2.15 million people were in contact with mental health services in July 2025; 22.6% of adults reported depression or anxiety (up from 19.7%).

Why should I read this?

Look — this is one of those reports you don’t want to skim. It’s not just grim stats: it shows clear actions that actually work, and it ties them to hard cash savings. If you manage people, hire staff or set company policy, reading this will save you time and a lot of payroll headaches. Quick wins: train your managers, offer reasonable adjustments and tackle workload — the data says those moves cut absence and keep talent.